add files for pa3
finish 1st part, heart attack
finish heart failure

note that the order function needs a “as.numeric” input to work
properly. see:

https://class.coursera.org/rprog-003/forum/thread?thread_id=1366
add some comments
complete rankhospital()
finish rankall()

construct the final data frame is a real pain in the ass
auto delete excel file
create excel file
auto